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LTC4557

Features: Power Management and Signal Level Translators for Two SIM Cards or Smart Cards Independent 1.8V/3V VCC Control for Both Cards Automatic Level Translation ISO7816, ETSI and EMV Compatible Dynamic Pull-Ups Deliver Fast Signal Rise Times* Built-In Fault Protection Circuitry Automatic Activ...

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SeekIC No. : 004402615 Detail

LTC4557: Features: Power Management and Signal Level Translators for Two SIM Cards or Smart Cards Independent 1.8V/3V VCC Control for Both Cards Automatic Level Translation ISO7816, ETSI and EMV Compatible ...

LTC4557 Data Sheet

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Part Number:
LTC4557
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/9/20

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Product Details

Description



Features:

  Power Management and Signal Level Translators for Two SIM Cards or Smart Cards
  Independent 1.8V/3V VCC Control for Both Cards
  Automatic Level Translation
  ISO7816, ETSI and EMV Compatible
  Dynamic Pull-Ups Deliver Fast Signal Rise Times*
  Built-In Fault Protection Circuitry
  Automatic Activation/Deactivation Sequencing Circuitry
  Low Operating/Shutdown Current
  >10kV ESD on SIM Card Pins
  Compatible with EMV Fault Tolerance Requirements
  Available in 16-Lead (3mm*3mm) QFN Package


Application

  GSM and 3G Cellular Phones
  Wireless P.O.S. Terminals
  Multiple SAM Card Interface


Pinout

Connection Diagram


Specifications

VBATT, DVCC, DATA, RSTIN, CLKIN,
ENABLE, M0, M1 to GND................................. 0.3V to 6V
I/OA, CLKA, RSTA .......................................... 0.3V to VCCA + 0.3V
I/OB, CLKB, RSTB .......................................... 0.3V to VCCB + 0.3V
ICCA,B (Note 4) ............................................ 80mA
VCCA,B Short-Circuit Duration ...................... Indefinite
Operating Temperature Range (Note 3) ..... 40°C to 85°C
Storage Temperature Range ...................... 65°C to 125°


Description

The LTC®4557 provides power conversion and signal level translation needed for 2.5G and 3G cellular telephones to interface with 1.8V or 3V subscriber identity modules (SIMs). The part meets all requirements for 1.8V and 3V SIMs. The part contains LDO regulators to power 1.8V or 3V SIM cards from a 2.7V to 5.5V input. The output voltages can be set using the two voltage selection pins and up to 50mA of load current can be supplied.

Internal level translators of LTC4557 allow controllers operating with supplies as low as 1.2V to interface with 1.8V or 3V smart cards. Battery life is maximized by a low operating current of less than 100mA and a shutdown current of less than 1mA. Board area is minimized by the low profile 3mm×3mm ×0.75mm leadless QFN package.




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